- Deserialization of TaskInstances (sometimes?) caused problems when monitoring child tasks (167)
- Updated Spark to 3.0.0 (169)
- Added an `--image` option to `cowait notebook`, allowing it to use other remote images, such as `cowait/spark` (169)
- Properly encode gzipped environment variables (170)
- Fixed a bug in `cowait run` (see 163)